Rate limit programmatic update checks for extensions

extensions/browser/event_router.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_BROWSER_EVENT_ROUTER_H_
 #define EXTENSIONS_BROWSER_EVENT_ROUTER_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 146 matching lines @@
   void RemoveFilteredEventListener(const std::string& event_name,
                                    content::RenderProcessHost* process,
                                    const std::string& extension_id,
                                    const base::DictionaryValue& filter,
                                    bool remove_lazy_listener);
 
   // Returns true if there is at least one listener for the given event.
   bool HasEventListener(const std::string& event_name);
 
   // Returns true if the extension is listening to the given event.
-  bool ExtensionHasEventListener(const std::string& extension_id,
-                                 const std::string& event_name);
+  virtual bool ExtensionHasEventListener(const std::string& extension_id,
+                                         const std::string& event_name);
 
   // Return or set the list of events for which the given extension has
   // registered.
   std::set<std::string> GetRegisteredEvents(const std::string& extension_id);
   void SetRegisteredEvents(const std::string& extension_id,
                            const std::set<std::string>& events);
 
   // Broadcasts an event to every listener registered for that event.
   virtual void BroadcastEvent(scoped_ptr<Event> event);
 
@@ skipping 250 matching lines @@
   const std::string event_name;
 
   const std::string extension_id;
   const GURL listener_url;
   content::BrowserContext* browser_context;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EVENT_ROUTER_H_